Which developments of the 1920s contributed to an improvement in the American standard of living? Select four options.

greater amount of leisure time

better means of communication

increased availability of automobiles

more effort to save money for the future

more types of entertainment from new technology

The most suitable answers are,

Explanation:

the communications technology had developed with the introduction of radio, technology, gramophone, etc. This enhanced the types and the quality of entertainment and the ways people were exposed to it and enjoyed it.

Moreover, the development of transportation systems, automobiles, trains systems increased the standard of living of many people.

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.

c it says nothing about connecting those 2 seas.